January 8, 2012
by John Vidale
Something is moving on Rainier, almost certainly the glaciers, as discussed in the last blog post by Kate. Below are the last ten minutes in a spectrogram plot. It shows the recordings at four different stations, and indicates a string of tiny earthquakes (we call them icequakes, even they do shake the Earth).
Below is the more traditional seismogram plot, accesible through this link, showing the last 6 hours of unremitting activity. It shows the vertical motion at the station STAR, which is right on the side of the volcano.
For plot purists, the plot above shows activity at 22:30 UTC, which is 2:30pm here in Solstice Cafe on University Ave by UW. This 10-minute interval, with 4 or 5 bursts of motion, is the 3rd line from the bottom on the plot below. Each line plots ten minutes of activity, and the slightly different colors of blue distinguish the different 10-minute lines. From the plot above, it is apparent that there are numerous tiny vibrations in addition to the larger (though still small) bursts.
This yammering has been non-stop for several days, and can actually interfere with monitoring the seismic network, as events are frequently triggering the earthquake detection software, filling the queue to process, and fraying the nerves of our analysts.
Not to mention vexing those of us who are never really sure we understand our observations as well as we think we do.
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- Seismic recordings of a gas explosion in North Bend, WA
- Seismic signals generated by the March 22nd Oso Landslide
- Legacy web site content returns
- Ice avalanches on Cascade volcanoes
- A New View On What's Shaking on the Cascade Volcanoes
- Seismic Spectrograms - A new way to look at wiggles
- The final football game analysis
- The Football Game Experiment Continues
- Seismic Game Analysis
- May (1)
- April (1)
- March (2)
- February (3)
- January (4)
- October (1)
- September (1)
- August (1)
- June (1)
- April (3)
- March (4)
- February (1)
- January (2)
- December (1)
- November (2)
- October (3)
- September (1)
- August (3)
- July (2)
- June (4)
- May (4)
- April (2)
- The wech-o-meter takes over all of Cascadia
- Keystone Cops: Italy prosecutes seismologists for failure to predict deadly quake
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- Mystery chirp near Newberry Volcano
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- 15 years of mostly silent magma inflation near Three Sisters, Oregon
- Mount Hood earthquake swarm of Feb 23, 2012
- Web glitches: duplicate (and even triplicate!) earthquakes
- How earthquake magnitude scales work
- Mine blast masquerades as volcanic tremor
- The Spokane Swarm about 10 years ago
- Another hum around Mount St. Helens
- Slow slip: A new kind of earthquake under our feet
- PNSN and social media
- 3am M3.4 earthquake in St. Helens Seismic Zone
- The wrong kind of volcano noise
- Fast chatter on Rainier an hour ago
- Can slush-mageddon trigger earthquakes?
- Rainier Repeating Earthquakes Update and Comparison with Weather Patterns
- 22-minutes drumbeat icequakes(?)
- Mount Rainier popping away
- Repeating Earthquakes on Mount Rainier - are glaciers the culprit?
- Debunking another SEC football myth by the PAC-12
- One year ago, Seattle Seahawks 12th Man Earthquake
- The odds this year of a megaquake on the Pacific Northwest coast
- Is the plague of great earthquakes this decade a sign of increased danger?
- Nile Valley landslide talks to PNSN seismologists
- Good vs evil in central US earthquake hazard analysis
- Why does a volcano scream?
- Predicting big quakes from patterns of little ones
- 1-hour warning for Japanese M9 earthquake?
- Sound Transit train under Interlaken keeps a rollin'
- Invisible changes under the hood at the PNSN
- Sound Transit Tunneling Noise
- "Visionary" toads
- Earthquake early warning in the PNW
- November (1)
- December (13)